192 clutches and power-stop control – Stop mechanism – Safety device
Reexamination Certificate
2000-03-06
2001-11-06
Bonck, Rodney H. (Department: 3681)
192 clutches and power-stop control
Stop mechanism
Safety device
C074S612000
Reexamination Certificate
active
06311817
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the safety of machines and more particularly the safety of the personnel monitoring and/or controlling these machines.
BACKGROUND OF THE INVENTION
There exist numerous machines having moving parts which can be dangerous for the person now working with the machines. Among such machines are for example presses, extruders, molding machines, grinders, which all have movable members adapted to cause accidents if people using these machines have the possibility to enter danger zones of these machines.
To avoid accidents, it has been proposed to provide protector elements, grills, panels or other members, displaceable from an inactive position in which access to the machine is permitted, to an active position in which certain zones of the machine are no longer accessible. An automatic device ensures that the supply of energy to the machine be interrupted as soon as the protector element is no longer active.
Such protector devices for machines are for example described in EP 0 363 810; GB 1 534 606; GB 2 084 279; GB 2 132 933 and U.S. Pat. No. 3,902,582.
In certain types of machines, for example granulators, the danger zone of the machine must be observed during observation of the latter, the protector elements must be transparent, or provided with grills. But during their operation, these machines throw particles against the protector elements, rendering them opaque. To clean these protector elements, it is necessary, with existing machines, to stop the machine and then to restart it only when the cleaned protector element is in place.
This leads to frequent stopping and substantial down time of the machine whose productivity is considerably lowered.
SUMMARY OF THE INVENTION
The present invention has for its object to ensure the security of people working with the machine whilst avoiding frequent stopping of the latter for cleaning the protector elements.
The present invention has for its object a protector device for a machine overcoming the mentioned drawbacks and permitting achieving the object stated above.
The protector device according to the invention is distinguished by the characteristics set forth in the claims of the present application.
REFERENCES:
patent: 3902582 (1975-09-01), Cross
patent: 3912061 (1975-10-01), Foster
patent: 3996815 (1976-12-01), Walker
patent: 4170880 (1979-10-01), Lou
patent: 4179987 (1979-12-01), Dohm
patent: 4307798 (1981-12-01), Watanabe
patent: 196 15 588 (1997-10-01), None
patent: 0 363 810 (1990-04-01), None
patent: 2 245 474 (1975-04-01), None
patent: 638129 (1950-05-01), None
patent: 1 534 606 (1978-12-01), None
patent: 2 084 279 (1982-04-01), None
patent: 2 132 933 (1984-07-01), None
patent: 2 076 921 (1981-12-01), None
patent: 2-30349 (1990-01-01), None
Bonck Rodney H.
Nestec SA
Young & Thompson
LandOfFree
Protector device for a machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Protector device for a machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Protector device for a machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2580200